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Keywords:

  • aromaticity;
  • boron;
  • carbenes;
  • heterocycles;
  • lithium
Thumbnail image of graphical abstract

NB! The anionic ligand 2 was synthesized through deprotonation of a planar, formally zwitterionic diazadiborine precursor, isolated as a lithium salt, and structurally characterized. According to experimental evidence and theoretical calculations, 2 can be considered as an intermediate between two classical classes of ligands: N-heterocyclic carbenes 1 and terphenyls 3.